Flashcards in 2.2.3 and 2.2.4 Deck (23):

1

## Correlation coefficient

### A statistical index of the relationship between two things (from -1 to +1)

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## Scatter plot

### A graphed cluster of dots each of which represents the values of two variables. The slope of the points suggest the direction of the relationship between the two variables. The amount of scatter suggests the strength of the correlation (little scatter indicates high correlation)

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## Saying that a correlation is "negative" does not say anything about....

### It's strength or weakness

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## A correlation is negative when...

### One goes up and one goes down

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## Statistics can help us see...

### What the naked eye sometimes misses

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## Correlations can help us

### Predict

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## No matter how strong a relationship....

### it does not prove anything

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## Illusory correlation

### The perception of a relationship where none exists

9

## When we see a random coincidences...

### we may forget that they are random and instead see them as a correlation

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## Something random can be seen as...

### In order

11

## Experiment

### A research method in which an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable) be random assignment of participants the experimenter aims of control other relevant factors

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## Experiments enable a researcher to focus on the possible effects of one or more factors by

### Manipulating the factors of interest and holding consent (controlling) other factors

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## Random assignment

### Assigning participants to experimental and control groups by chance this minimizing preexisting differences between those assigned to the different groups

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## Correlational=

### Natural

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## Experiment

### Manupulative

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## Double-blind procedure

### An experimental procedure in which both the research participants and the research staff are ignorant about whether the research participants have received the treatment or a placebo. Commonly used in the drug-evaluation studies

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## Placebo effect

### Experimental results caused by the expectant films along; and effect on behavior caused by the administration of an inert substance or condition which the recipient assumes is an active agent

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## Experimental group

### In an experiment the group that is exposed to the treatment that is to one version of the independent variable

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## Control group

### In an experiment the group that is not exposed to the treatment; contrast with the experimental group and serves as a comparison for evaluating the effect of the treatment

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## Independent variable

### The experimental facto that is manipulated

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## Confounding variable

### A factor other than the independent carnival that might produce and effect in an experiment

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## Dependent variable

### The outcome factor; the variable that may change in response to manipulations of the independent variable

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